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Macro lens distance

A macroscopic (or macro) lens for a camera is usually a converging lens of normal focal length built into a lens barrel that can be adjusted to provide the additional lens-to-film distance needed when focusing at very close range. Suppose that a macro lens (f = 53.0 mm) has a maximum lens-to-film distance of 271 mm. How close can the object be located in front of the lens?

Solution Preview

The relationship between the distance of an object from a lens, the distance of an image from a lens, and the focal length is given simply by:

1/d_o + 1/d_i = 1/f

Where d_o is the object distance, d_i is the image distance, and f is the focal length.

In this problem, we ...

Solution Summary

This solution is 226 words and provides an equation for focal length, and uses simple inputting of knowns to find the distance.